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The reason for this amp is to allow the use of a series of tubes. However, the 6CG7 (6SN7) is a different beast. Here is a design for a 6CG7/6SN7 version which, coincidentally, will also make use of your 100kΩ Alps potentiometer.

Unfortunately, 100kΩ is too small to use in this design as is. However, if you replace the 250kΩ pot in the design with just a 250kΩ resistor, you can put the 100kΩ pot on the front end and it will work fine.

Alex Q wrote:

Can i used 6CG7 for this preamp?

The reason for this amp is to allow the use of a series of tubes. However, the 6CG7 (6SN7) is a different beast. Here is a design for a 6CG7/6SN7 version which, coincidentally, will also make use of your 100kΩ Alps potentiometer.

Hi Matt, I will get the 250K instead i still need to order some parts anyway,This 4S is to drive the Headphone amp that you designed by the way the more i listened to this amp the more i like it to my ears it is comparable to the kit that i got which the kit is 3X more expensive.Thanks again!

The reason for this amp is to allow the use of a series of tubes. However, the 6CG7 (6SN7) is a different beast. Here is a design for a 6CG7/6SN7 version which, coincidentally, will also make use of your 100kΩ Alps potentiometer.

Power transformers are all HI-Pot tested these days and transformer microphonics is practically non-existant in modern units. Personally I always make sure I have a good ground between the chassis and the transformer end bells. This just makes shielding that much better and provides a guaranteed ground path in the event of catastrophic transformer failure. The industry chassis ground bonding standard is 2mΩ.

Power transformers are all HI-Pot tested these days and transformer microphonics is practically non-existant in modern units. Personally I always make sure I have a good ground between the chassis and the transformer end bells. This just makes shielding that much better and provides a guaranteed ground path in the event of catastrophic transformer failure. The industry chassis ground bonding standard is 2mΩ.

I just started working on the amp and realized i don't have enough solid core wires the local supplier only have 20 gauge stranded wires, is there advantage on using a solid vs stranded,Which type of wires(Solid or stranded)do you guys used for your build?Thanks!

I use solid core only in the audio path. Usually wire-wrap wire which fine copper wire with a silver plating. Or more recently solid core Cat5. I never use shielded wire for interconnects or in wiring amps and preamps.

I use solid core only in the audio path. Usually wire-wrap wire which fine copper wire with a silver plating. Or more recently solid core Cat5. I never use shielded wire for interconnects or in wiring amps and preamps.

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